gstreamer/gst-libs/gst/gl/eagl/gstglcontext_eagl.m

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/*
* GStreamer
* Copyright (C) 2014 Sebastian Dröge <sebastian@centricular.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#import <OpenGLES/EAGL.h>
#import <QuartzCore/QuartzCore.h>
#import <UIKit/UIKit.h>
#include <OpenGLES/ES2/gl.h>
#include "gstglcontext_eagl.h"
static gboolean gst_gl_context_eagl_create_context (GstGLContext * context,
GstGLAPI gl_api, GstGLContext * other_context, GError ** error);
static void gst_gl_context_eagl_destroy_context (GstGLContext * context);
static gboolean gst_gl_context_eagl_choose_format (GstGLContext * context,
GError ** error);
static guintptr gst_gl_context_eagl_get_gl_context (GstGLContext * window);
static gboolean gst_gl_context_eagl_activate (GstGLContext * context,
gboolean activate);
static void gst_gl_context_eagl_swap_buffers (GstGLContext * context);
static GstGLAPI gst_gl_context_eagl_get_gl_api (GstGLContext * context);
static GstGLPlatform gst_gl_context_eagl_get_gl_platform (GstGLContext *
context);
struct _GstGLContextEaglPrivate
{
EAGLContext *eagl_context;
/* Used if we render to a window */
CAEAGLLayer *eagl_layer;
GLuint framebuffer;
GLuint color_renderbuffer;
GLuint depth_renderbuffer;
};
#define GST_GL_CONTEXT_EAGL_GET_PRIVATE(o) \
(G_TYPE_INSTANCE_GET_PRIVATE((o), GST_GL_TYPE_CONTEXT_EAGL, GstGLContextEaglPrivate))
G_DEFINE_TYPE (GstGLContextEagl, gst_gl_context_eagl, GST_GL_TYPE_CONTEXT);
static void
gst_gl_context_eagl_class_init (GstGLContextEaglClass * klass)
{
GstGLContextClass *context_class;
context_class = (GstGLContextClass *) klass;
g_type_class_add_private (klass, sizeof (GstGLContextEaglPrivate));
context_class->destroy_context =
GST_DEBUG_FUNCPTR (gst_gl_context_eagl_destroy_context);
context_class->create_context =
GST_DEBUG_FUNCPTR (gst_gl_context_eagl_create_context);
context_class->choose_format =
GST_DEBUG_FUNCPTR (gst_gl_context_eagl_choose_format);
context_class->get_gl_context =
GST_DEBUG_FUNCPTR (gst_gl_context_eagl_get_gl_context);
context_class->activate = GST_DEBUG_FUNCPTR (gst_gl_context_eagl_activate);
context_class->swap_buffers =
GST_DEBUG_FUNCPTR (gst_gl_context_eagl_swap_buffers);
context_class->get_gl_api =
GST_DEBUG_FUNCPTR (gst_gl_context_eagl_get_gl_api);
context_class->get_gl_platform =
GST_DEBUG_FUNCPTR (gst_gl_context_eagl_get_gl_platform);
}
static void
gst_gl_context_eagl_init (GstGLContextEagl * context)
{
context->priv = GST_GL_CONTEXT_EAGL_GET_PRIVATE (context);
}
/* Must be called in the gl thread */
GstGLContextEagl *
gst_gl_context_eagl_new (void)
{
GstGLContextEagl *context = g_object_new (GST_GL_TYPE_CONTEXT_EAGL, NULL);
return context;
}
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void
gst_gl_context_eagl_resize (GstGLContextEagl * eagl_context)
{
int width, height;
glBindRenderbuffer (GL_RENDERBUFFER, eagl_context->priv->color_renderbuffer);
[eagl_context->priv->eagl_context renderbufferStorage:GL_RENDERBUFFER fromDrawable:eagl_context->priv->eagl_layer];
glGetRenderbufferParameteriv (GL_RENDERBUFFER,
GL_RENDERBUFFER_WIDTH, &width);
glGetRenderbufferParameteriv (GL_RENDERBUFFER,
GL_RENDERBUFFER_HEIGHT, &height);
glBindRenderbuffer (GL_RENDERBUFFER, eagl_context->priv->depth_renderbuffer);
glRenderbufferStorage (GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, width,
height);
}
static gboolean
gst_gl_context_eagl_create_context (GstGLContext * context, GstGLAPI gl_api,
GstGLContext * other_context, GError ** error)
{
GstGLContextEagl *context_eagl = GST_GL_CONTEXT_EAGL (context);
GstGLContextEaglPrivate *priv = context_eagl->priv;
GstGLWindow *window = gst_gl_context_get_window (context);
UIView *window_handle = nil;
dispatch_sync (dispatch_get_main_queue (), ^{
if (other_context) {
EAGLContext *external_gl_context = (EAGLContext *)
gst_gl_context_get_gl_context (other_context);
EAGLSharegroup *share_group = [external_gl_context sharegroup];
priv->eagl_context = [[EAGLContext alloc] initWithAPI: kEAGLRenderingAPIOpenGLES2 sharegroup:share_group];
[share_group release];
} else {
priv->eagl_context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
}
});
if (window)
window_handle = (UIView *) gst_gl_window_get_window_handle (window);
if (window_handle) {
__block GLuint framebuffer;
__block GLuint color_renderbuffer;
__block GLuint depth_renderbuffer;
__block GLint width;
__block GLint height;
__block CAEAGLLayer *eagl_layer;
GLenum status;
dispatch_sync (dispatch_get_main_queue (), ^{
eagl_layer = (CAEAGLLayer *)[window_handle layer];
[EAGLContext setCurrentContext:priv->eagl_context];
/* Allocate framebuffer */
glGenFramebuffers (1, &framebuffer);
glBindFramebuffer (GL_FRAMEBUFFER, framebuffer);
/* Allocate color render buffer */
glGenRenderbuffers (1, &color_renderbuffer);
glBindRenderbuffer (GL_RENDERBUFFER, color_renderbuffer);
[priv->eagl_context renderbufferStorage: GL_RENDERBUFFER fromDrawable:eagl_layer];
glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
GL_RENDERBUFFER, color_renderbuffer);
/* Get renderbuffer width/height */
glGetRenderbufferParameteriv (GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH,
&width);
glGetRenderbufferParameteriv (GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT,
&height);
/* allocate depth render buffer */
glGenRenderbuffers (1, &depth_renderbuffer);
glBindRenderbuffer (GL_RENDERBUFFER, depth_renderbuffer);
glRenderbufferStorage (GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, width,
height);
glFramebufferRenderbuffer (GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
GL_RENDERBUFFER, depth_renderbuffer);
[EAGLContext setCurrentContext:nil];
});
[EAGLContext setCurrentContext:priv->eagl_context];
glBindFramebuffer (GL_FRAMEBUFFER, framebuffer);
/* check creation status */
status = glCheckFramebufferStatus (GL_FRAMEBUFFER);
if (status != GL_FRAMEBUFFER_COMPLETE) {
GST_ERROR ("Failed to make complete framebuffer object %x", status);
if (window)
gst_object_unref (window);
return FALSE;
}
glBindFramebuffer (GL_FRAMEBUFFER, 0);
priv->eagl_layer = eagl_layer;
priv->framebuffer = framebuffer;
priv->color_renderbuffer = color_renderbuffer;
priv->depth_renderbuffer = depth_renderbuffer;
} else {
priv->eagl_layer = NULL;
priv->framebuffer = 0;
priv->color_renderbuffer = 0;
priv->depth_renderbuffer = 0;
}
if (window)
gst_object_unref (window);
return TRUE;
}
static void
gst_gl_context_eagl_destroy_context (GstGLContext * context)
{
GstGLContextEagl *context_eagl;
context_eagl = GST_GL_CONTEXT_EAGL (context);
if (!context_eagl->priv->eagl_context)
return;
if (context_eagl->priv->eagl_layer) {
gst_gl_context_eagl_activate (context, TRUE);
[context_eagl->priv->eagl_context renderbufferStorage: GL_RENDERBUFFER fromDrawable:nil];
glDeleteFramebuffers (1, &context_eagl->priv->framebuffer);
context_eagl->priv->framebuffer = 0;
glDeleteRenderbuffers (1, &context_eagl->priv->depth_renderbuffer);
context_eagl->priv->depth_renderbuffer = 0;
glDeleteRenderbuffers (1, &context_eagl->priv->color_renderbuffer);
context_eagl->priv->color_renderbuffer = 0;
context_eagl->priv->eagl_layer = nil;
gst_gl_context_eagl_activate (context, FALSE);
}
[context_eagl->priv->eagl_context release];
context_eagl->priv->eagl_context = nil;
}
static gboolean
gst_gl_context_eagl_choose_format (GstGLContext * context, GError ** error)
{
GstGLContextEagl *context_eagl;
GstGLWindow *window;
UIView *window_handle = nil;
context_eagl = GST_GL_CONTEXT_EAGL (context);
window = gst_gl_context_get_window (context);
if (!window)
return TRUE;
if (window)
window_handle = (UIView *) gst_gl_window_get_window_handle (window);
if (!window_handle) {
gst_object_unref (window);
return TRUE;
}
dispatch_sync (dispatch_get_main_queue (), ^{
CAEAGLLayer *eagl_layer;
NSDictionary * dict =[NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:NO], kEAGLDrawablePropertyRetainedBacking,
kEAGLColorFormatRGBA8, kEAGLDrawablePropertyColorFormat, nil];
eagl_layer = (CAEAGLLayer *)[window_handle layer];
[eagl_layer setOpaque:YES];
[eagl_layer setDrawableProperties:dict];
});
gst_object_unref (window);
return TRUE;
}
static guintptr
gst_gl_context_eagl_get_gl_context (GstGLContext * context)
{
return (guintptr) GST_GL_CONTEXT_EAGL (context)->priv->eagl_context;
}
void
gst_gl_context_eagl_prepare_draw (GstGLContextEagl * context)
{
if (!context->priv->eagl_layer)
return;
glBindFramebuffer (GL_FRAMEBUFFER, context->priv->framebuffer);
glBindRenderbuffer (GL_RENDERBUFFER, context->priv->color_renderbuffer);
}
void
gst_gl_context_eagl_finish_draw (GstGLContextEagl * context)
{
if (!context->priv->eagl_layer)
return;
glBindRenderbuffer (GL_RENDERBUFFER, 0);
glBindFramebuffer (GL_FRAMEBUFFER, 0);
}
static void
gst_gl_context_eagl_swap_buffers (GstGLContext * context)
{
GstGLContextEagl *context_eagl;
context_eagl = GST_GL_CONTEXT_EAGL (context);
if (!context_eagl->priv->eagl_layer)
return;
[context_eagl->priv->eagl_context presentRenderbuffer:GL_RENDERBUFFER];
}
static gboolean
gst_gl_context_eagl_activate (GstGLContext * context, gboolean activate)
{
GstGLContextEagl *context_eagl;
context_eagl = GST_GL_CONTEXT_EAGL (context);
if (activate) {
EAGLContext *cur_ctx =[EAGLContext currentContext];
if (cur_ctx == context_eagl->priv->eagl_context) {
GST_DEBUG ("Already attached the context to thread %p", g_thread_self ());
return TRUE;
}
GST_DEBUG ("Attaching context to thread %p", g_thread_self ());
if ([EAGLContext setCurrentContext:context_eagl->priv->eagl_context] == NO) {
GST_ERROR ("Couldn't make context current");
return FALSE;
}
} else {
GST_DEBUG ("Detaching context from thread %p", g_thread_self ());
if ([EAGLContext setCurrentContext:nil] == NO) {
GST_ERROR ("Couldn't unbind context");
return FALSE;
}
}
return TRUE;
}
static GstGLAPI
gst_gl_context_eagl_get_gl_api (GstGLContext * context)
{
return GST_GL_API_GLES2;
}
static GstGLPlatform
gst_gl_context_eagl_get_gl_platform (GstGLContext * context)
{
return GST_GL_PLATFORM_EAGL;
}
guintptr
gst_gl_context_eagl_get_current_context (void)
{
return (guintptr) [EAGLContext currentContext];
}